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sr.go
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sr.go
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package sr
//Copyright 2016 MediaMath <http://www.mediamath.com>. All rights reserved.
//Use of this source code is governed by a BSD-style
//license that can be found in the LICENSE file.
import (
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"net/url"
"path"
"strings"
)
//Schema is a string that represents a avro schema
type Schema string
//EmptySchema is the 'zero' value for a Schema
var EmptySchema = Schema("")
//SchemaJSON is what the schema registry expects when sending it a schema
type SchemaJSON struct {
Schema Schema `json:"schema"`
}
//ConfigGetJSON is what the schema registry returns on config get endpoints
type ConfigGetJSON struct {
Compatibility string `json:"compatibilityLevel"`
}
//ConfigPutJSON is what the schema registry expects on config put endpoints
type ConfigPutJSON struct {
Compatibility string `json:"compatibility"`
}
//GetLatestSchema returns the latest schema and id for a subject
func GetLatestSchema(client HTTPClient, url string, subject Subject) (id uint32, schema Schema, err error) {
return GetVersion(client, url, subject, "latest")
}
//GetVersion returns a schema and id for a subject and version
func GetVersion(client HTTPClient, url string, subject Subject, version string) (id uint32, schema Schema, err error) {
schema = EmptySchema
var req *http.Request
var status int
var body []byte
req, err = GetVersionRequest(url, subject, version)
if err == nil {
schemaResponse := struct {
ID uint32 `json:"id"`
Schema Schema `json:"schema"`
}{}
status, body, err = doJSON(client, req, &schemaResponse)
if err == nil {
id = schemaResponse.ID
schema = schemaResponse.Schema
}
}
if err == nil && schema == EmptySchema {
err = fmt.Errorf("%v:%s", status, body)
}
return
}
//GetSchema returns a schema for an id
func GetSchema(client HTTPClient, url string, id uint32) (schema Schema, err error) {
schema = EmptySchema
var req *http.Request
req, err = GetSchemaRequest(url, id)
if err == nil {
schemaResponse := &SchemaJSON{}
_, _, err = doJSON(client, req, &schemaResponse)
if err == nil {
schema = schemaResponse.Schema
}
}
return
}
//Register adds a schema to a subject and returns the new id
func Register(client HTTPClient, url string, subject Subject, schema Schema) (id uint32, err error) {
var req *http.Request
var status int
var result []byte
body := SchemaJSON{schema}
req, err = RegisterRequest(url, subject, &body)
if err == nil {
idResponse := struct {
ID uint32 `json:"id"`
}{}
status, result, err = doJSON(client, req, &idResponse)
if err == nil {
id = idResponse.ID
}
}
if err == nil && id == uint32(0) {
err = fmt.Errorf("%v:%v:%s", status, req, result)
}
return
}
//HasSchema returns the version and id for a schema on a subject
func HasSchema(client HTTPClient, url string, subject Subject, schema Schema) (version int, id int, err error) {
var req *http.Request
body := &SchemaJSON{schema}
req, err = HasSchemaRequest(url, subject, body)
if err == nil {
checkedSchema := struct {
Schema Schema `json:"schema"`
Version int `json:"version"`
Subject Subject `json:"subject"`
ID int `json:"id"`
}{}
_, _, err = doJSON(client, req, &checkedSchema)
if err == nil {
version = checkedSchema.Version
id = checkedSchema.ID
}
}
return
}
//IsCompatible will return if the provided schema is compatible with the subject and version provided. Version can either be a numeric version or 'latest'
func IsCompatible(client HTTPClient, url string, subject Subject, version string, schema Schema) (is bool, err error) {
var req *http.Request
body := &SchemaJSON{schema}
req, err = CheckIsCompatibleRequest(url, subject, version, body)
if err == nil {
isCompatible := struct {
IsCompatible bool `json:"is_compatible"`
}{}
var status int
var body []byte
status, body, err = doJSON(client, req, &isCompatible)
if status != 200 {
err = fmt.Errorf("Unexpected return code: %v:%s", status, body)
}
if err == nil {
is = isCompatible.IsCompatible
}
}
return
}
//ListSubjects returns the list of subjects
func ListSubjects(client HTTPClient, url string) (subjects []Subject, err error) {
var req *http.Request
req, err = ListSubjectsRequest(url)
if err == nil {
_, _, err = doJSON(client, req, &subjects)
}
return
}
//ListVersions returns the list of versions for a subject
func ListVersions(client HTTPClient, url string, subject Subject) (versions []int, err error) {
var req *http.Request
req, err = ListVersionsRequest(url, subject)
if err == nil {
_, _, err = doJSON(client, req, &versions)
}
return
}
//GetSubjectDerivedCompatibility returns the compatibility level for a subject or the default if a subject specific doesnt exist
func GetSubjectDerivedCompatibility(client HTTPClient, url string, subject Subject) (compatibility Compatibility, err error) {
compatibility = Zero
var status int
var req *http.Request
req, err = GetSubjectConfigRequest(url, subject)
if err == nil {
status, compatibility, err = compatibilityJSON(client, req)
}
if err == nil && status == http.StatusNotFound {
compatibility, err = GetDefaultCompatibility(client, url)
}
return
}
//SetSubjectCompatibility sets the compatibility level for a subject
func SetSubjectCompatibility(client HTTPClient, url string, subject Subject, compatibility Compatibility) (result Compatibility, err error) {
result = Zero
var (
req *http.Request
responseBody []byte
status int
body = &ConfigPutJSON{Compatibility: string(compatibility)}
response = &ConfigPutJSON{}
)
req, err = PutSubjectConfigRequest(url, subject, body)
if err == nil {
status, responseBody, err = doJSON(client, req, response)
}
if err == nil && status != http.StatusOK {
err = fmt.Errorf("Unknown response (%v) (%s)", status, responseBody)
}
if err == nil {
result = Compatibility(response.Compatibility)
}
return
}
//GetSubjectCompatibility returns the compatibility level for a subject
func GetSubjectCompatibility(client HTTPClient, url string, subject Subject) (compatibility Compatibility, err error) {
compatibility = Zero
var req *http.Request
req, err = GetSubjectConfigRequest(url, subject)
if err == nil {
_, compatibility, err = compatibilityJSON(client, req)
}
return
}
//GetDefaultCompatibility returns the compatibility level set at the server level
func GetDefaultCompatibility(client HTTPClient, url string) (compatibility Compatibility, err error) {
compatibility = Zero
var req *http.Request
req, err = GetConfigRequest(url)
if err == nil {
_, compatibility, err = compatibilityJSON(client, req)
}
return
}
func compatibilityJSON(client HTTPClient, req *http.Request) (status int, compatibility Compatibility, err error) {
compatibility = Zero
configResponse := &ConfigGetJSON{}
status, _, err = doJSON(client, req, &configResponse)
if err == nil {
compatibility = Compatibility(configResponse.Compatibility)
}
return
}
//GetSchemaRequest returns the http.Request for GET /schemas/ids/<id> route
func GetSchemaRequest(baseURL string, id uint32) (*http.Request, error) {
return get(baseURL, path.Join("schemas", "ids", fmt.Sprintf("%v", id)))
}
//RegisterRequest returns the http.Request for the POST /subjects/<subject>/versions
func RegisterRequest(baseURL string, subject Subject, body *SchemaJSON) (*http.Request, error) {
return post(baseURL, path.Join("subjects", string(subject), "versions"), body)
}
//GetVersionRequest returns the http.Request for the GET /subjects/<subject>/versions/<version> version can either be a number or 'latest'
func GetVersionRequest(baseURL string, subject Subject, version string) (*http.Request, error) {
return get(baseURL, path.Join("subjects", string(subject), "versions", version))
}
//HasSchemaRequest returns the http.Request for the POST /subjects/<subject>
func HasSchemaRequest(baseURL string, subject Subject, body *SchemaJSON) (*http.Request, error) {
return post(baseURL, path.Join("subjects", string(subject)), body)
}
//CheckIsCompatibleRequest returns the http.Request for the POST /compatibility/subjects/<subject>/versions/<version> route
func CheckIsCompatibleRequest(baseURL string, subject Subject, version string, body *SchemaJSON) (*http.Request, error) {
return post(baseURL, path.Join("compatibility", "subjects", string(subject), "versions", version), body)
}
//ListSubjectsRequest returns the GET /subjects
func ListSubjectsRequest(baseURL string) (*http.Request, error) {
return get(baseURL, "subjects")
}
//ListVersionsRequest returns GET /subjects/<subject>/versions
func ListVersionsRequest(baseURL string, subject Subject) (*http.Request, error) {
return get(baseURL, path.Join("subjects", string(subject), "versions"))
}
//GetConfigRequest returns the http.Request for the GET /config route
func GetConfigRequest(baseURL string) (*http.Request, error) {
return get(baseURL, "config")
}
//GetSubjectConfigRequest returns the http.Request for the GET /config route
func GetSubjectConfigRequest(baseURL string, subject Subject) (*http.Request, error) {
return get(baseURL, path.Join("config", string(subject)))
}
//PutSubjectConfigRequest returns the http.Request for the Put /config/<subject> route
func PutSubjectConfigRequest(baseURL string, subject Subject, body *ConfigPutJSON) (*http.Request, error) {
return put(baseURL, path.Join("config", string(subject)), body)
}
const schemaRegistryAccepts = "application/vnd.schemaregistry.v1+json,application/vnd.schemaregistry+json, application/json"
func get(baseURL, query string) (request *http.Request, err error) {
var u string
u, err = buildURL(baseURL, query)
if err != nil {
return
}
request, err = http.NewRequest("GET", u, nil)
if request != nil {
request.Header.Add("Accept", schemaRegistryAccepts)
}
return
}
func put(baseURL, query string, body interface{}) (request *http.Request, err error) {
return putOrPost(baseURL, "PUT", query, body)
}
func post(baseURL, query string, body interface{}) (request *http.Request, err error) {
return putOrPost(baseURL, "POST", query, body)
}
func putOrPost(baseURL, method string, query string, body interface{}) (request *http.Request, err error) {
var reader io.Reader
if body != nil {
var data []byte
data, err = json.Marshal(body)
if err != nil {
return
}
reader = bytes.NewBuffer(data)
}
var u string
u, err = buildURL(baseURL, query)
if err != nil {
return
}
request, err = http.NewRequest(method, u, reader)
if request != nil {
request.Header.Add("Accept", schemaRegistryAccepts)
request.Header.Add("Content-Type", "application/vnd.schemaregistry.v1+json")
}
return
}
func buildURL(baseURL, endpoint string) (string, error) {
u, err := url.Parse(baseURL)
if err != nil {
return "", err
}
u.Path = path.Join(u.Path, endpoint)
return u.String(), nil
}
//HTTPClient is any client that can do a http request
type HTTPClient interface {
Do(request *http.Request) (*http.Response, error)
}
func doJSON(restful HTTPClient, request *http.Request, response interface{}) (status int, body []byte, err error) {
res, err := restful.Do(request)
if err == nil {
body, err = ioutil.ReadAll(res.Body)
res.Body.Close()
status = res.StatusCode
}
if err == nil && response != nil {
err = json.Unmarshal(body, response)
if err != nil {
err = fmt.Errorf("Unexpected response (%v) from %v.\n%s", status, request.URL, body)
}
}
return
}
func Copy(client HTTPClient, fromURL, toURL, fromPrefix, toPrefix string) (int, error) {
var total int
var subjects, err = ListSubjects(client, fromURL)
if err != nil {
return total, err
}
for _, subject := range subjects {
if strings.HasPrefix(string(subject), fromPrefix) {
var _, schema, err = GetLatestSchema(client, fromURL, subject)
if err != nil {
return total, err
}
var toSubject = strings.Replace(string(subject), fromPrefix, toPrefix, 1)
_, err = Register(client, toURL, Subject(toSubject), schema)
if err != nil {
return total, err
}
total++
}
}
return total, nil
}